Disabled jobs are always running

when running cron job using drush i noticed that disabled jobs also have been run

It seems a problem in `ultimate_cron/src/Entity/CronJob.php`

  public function isScheduled() {
    \Drupal::moduleHandler()->invokeAll('cron_pre_schedule', array($this));
    $result = empty($this->disabled) && !$this->isLocked() && $this->getPlugin('scheduler')
        ->isScheduled($this);
    \Drupal::moduleHandler()->invokeAll('cron_post_schedule', array($this));
    return $result;
  }

`$this->disabled` is not defined and `empty` always `TRUE`

Suggest to change to `empty($this->disabled)` to $this->status()

 $result = $this->status() && !$this->isLocked() && $this->getPlugin('scheduler')->isScheduled($this);